<template>
  <div>
    <h2>公告栏文字停顿滚动</h2>
    <div class="textBox">
      <transition name="slide">
        <p
          class="text"
          :key="text.id"
          @mouseenter="mouseenter"
          @mouseleave="mouseleave"
        >{{text.val}}</p>
      </transition>
    </div>
  </div>
</template>

<script>
// 参考：https://www.jianshu.com/p/f16bb819e240
export default {
  name: 'scroll',
  data () {
    return {
      textArr: [
        '1 第一条公告',
        '2 第二条公告第二条公告',
        '3 第三条公告第三条公告第三条公告'
      ],
      number: 0,
      timer: null
    }
  },
  computed: {
    text () {
      return {
        id: this.number,
        val: this.textArr[this.number]
      }
    }
  },
  mounted () {
    this.startMove()
  },
  methods: {
    mouseenter () {
      clearInterval(this.timer)
    },
    mouseleave () {
      this.startMove()
    },
    startMove () {
      this.timer = setTimeout(() => {
        if (this.number === 2) {
          this.number = 0
        } else {
          this.number += 1
        }
        this.startMove()
      }, 2000) // 滚动不需要停顿则将2000改成动画持续时间
    }
  }
}
</script>

<style scoped>
h2 {
  padding: 20px 0;
}
.textBox {
  width: 100%;
  height: 40px;
  margin: 0 auto;
  overflow: hidden;
  position: relative;
  text-align: center;
}
.text {
  width: 100%;
  position: absolute;
  bottom: 0;
}
.slide-enter-active,
.slide-leave-active {
  transition: all 0.5s linear;
}
.slide-enter {
  transform: translateY(20px) scale(1);
  opacity: 1;
}
.slide-leave-to {
  transform: translateY(-20px) scale(0.8);
  opacity: 0;
}
</style>
